/Engine/Source/Editor/Sequencer/Public/SequencerKeyParams.h
This channel may or may not be used for the final operation depending on the result of ChooseOperation()
void Populate ( [UMovieSceneTrack](API\Runtime\MovieScene\UMovieSceneTrack) * InTrack, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [ISequencerSection](API\Editor\Sequencer\ISequencerSection) > InSection, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IKeyArea](API\Editor\Sequencer\IKeyArea) > InKeyArea )